So i passed the OCAJP 8 last friday with 92%.
I learned and practiced for about 3 months, and this is because i had a break for about a month, so had to continue for where i was left, and repeat what i've learned.
I read OCA Java SE 8 Certification Guide by Mala Gupta which is great(read it twice because of the break).
Then took Enthuware tests which are great and i would recommend them to anyone who want's to take the test. Didn't like just the ambiguity on some answers, but besides that i would say that the real test is somewhat above 90% similar to the ones of Enthuware, except that enthuware is way harded. Also i work as a Java developer for more than 3 years.
So on the mock exam on the book by Mala Gupta i had 75%.
Enthuware test result:
Final Day Test: 80%
I would say that the test is really tricky, and questions tend to have details which is hard to see them the first time, so be careful to learn the smallest details on every chapter of the exam.
Good luck to anyone who wishes to enter the exam.